Best way to send anonymous email like craigslist

Question

Craigslist has a nice feature where when you respond to a poster you respond to an email such as job-fepsd-1120347193@craigslist.org. The email is then in turn direct

Answer 1

This is usually done by piping an e-mail address (often, a catch-all address) to PHP. Here's a tutorial on doing it that should get you started in the right direction.